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hvsi: don't panic on tty_register_driver failure

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[ Upstream commit 7ccbdcc4d0 ]

The alloc_tty_driver failure is handled gracefully in hvsi_init. But
tty_register_driver is not. panic is called if that one fails.

So handle the failure of tty_register_driver gracefully too. This will
keep at least the console functional as it was enabled earlier by
console_initcall in hvsi_console_init. Instead of shooting down the
whole system.

This means, we disable interrupts and restore hvsi_wait back to
poll_for_state().

Cc: linuxppc-dev@lists.ozlabs.org
Signed-off-by: Jiri Slaby <jslaby@suse.cz>
Link: https://lore.kernel.org/r/20210723074317.32690-3-jslaby@suse.cz
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
Jiri Slaby 2021-07-23 09:43:11 +02:00 committed by Greg Kroah-Hartman
parent dd3307a8b3
commit 2603740df8
1 changed files with 16 additions and 3 deletions
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19
drivers/tty/hvc/hvsi.c
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@ -1038,7 +1038,7 @@ static const struct tty_operations hvsi_ops = {
static int __init hvsi_init(void) static int __init hvsi_init(void)
{ {
int i; int i, ret;
hvsi_driver = alloc_tty_driver(hvsi_count); hvsi_driver = alloc_tty_driver(hvsi_count);
if (!hvsi_driver) if (!hvsi_driver)
@ -1069,12 +1069,25 @@ static int __init hvsi_init(void)
} }
hvsi_wait = wait_for_state; /* irqs active now */ hvsi_wait = wait_for_state; /* irqs active now */
if (tty_register_driver(hvsi_driver)) ret = tty_register_driver(hvsi_driver);
panic("Couldn't register hvsi console driver\n"); if (ret) {
pr_err("Couldn't register hvsi console driver\n");
goto err_free_irq;
}
printk(KERN_DEBUG "HVSI: registered %i devices\n", hvsi_count); printk(KERN_DEBUG "HVSI: registered %i devices\n", hvsi_count);
return 0; return 0;
err_free_irq:
hvsi_wait = poll_for_state;
for (i = 0; i < hvsi_count; i++) {
struct hvsi_struct *hp = &hvsi_ports[i];
free_irq(hp->virq, hp);
}
tty_driver_kref_put(hvsi_driver);
return ret;
} }
device_initcall(hvsi_init); device_initcall(hvsi_init);